Valve-gear for stram-engines



S. ROSENZWEIG. VALVE GEAR FOR STEAM ENGINES.

APPLICATION FILED DEC-XL i920- Patented July 19, N21,

lit.

ass-erase.

specification of Letters detest.

Patented Jilly in,

Application filed December it, rose. tieriel lilo. scans.

To all whom. it may concern:

Be it known that l, Smermnn BOBENZWEZG, a citizen of the United States,and a resident of the cit or New York, in the county and State of dewYork, have invented certain new and useful llmprovements in Valve- Gearsfor Steaindlngines, of which the following is a specification.

My. invention relates to a valve arrangement for reciprocating steamengines of the puppet valve type, and consists of certain improvementstherein which will first be described in connection with the accom'larged scale, of the elbow levers tor oper-- ating the valve spindles.

Fig. 2 represents in plan and in side elevation the elbow lever foroperating the steam valve spindle, and

Fig. 3 represents in similar views the elbow lever for operating theexhaust spindle.

The valve gear embodying the improvements shown herein is of. the samegeneral type as that illustrated in my companion application, Serial No.427,290, filed l lo-- vember 30, 1920, comprising, as it does, steam andexhaust valves mounted and ar ranged one upon the axial prolongation ofthe other, provided with spindles, one for each valve, the one spindlepassing axially through and telescoping with the other, the telescopedends of the spindles extending between lift members (one for eachspindle) mounted in suitable bearings at their exterior opposite freeends engaging each its appropriate one of the telescoped spindle ends,and anoperating shaft provided with suitable cam lifts or tappets foractuating the lift members.

In the embodiment of the invention illustrated in my companionapplication, Serial No. 427,290, the two sets of valves are placedparallel with one another crosswise of and at the opposite ends of theengine cylinder.

' ln the embodiment of the same shown herein hid the two sets of valvesare placed in tandem fashion lengthwise of the engine cylinder.

The improvements subject of my present application are measurably theoutgrowth oil the above-noted primary diderence between the twoembodiments.

Referring now to the accompanying drawing, 1l\ 1s a representation,largely diagrammatic, of that portion of the engine cylinder upon whichthe valve chambers are mounted. The two valve chambers may be mounted onand secured in any suitable wayto the englne cylinder, extendinglengthwise or" the latter, one upon-the axial prolongation of the otherand parallel with the axis of the engine cylinder, with an intediatespace between their interior opposite ends for the passage of the valve0 crating cam or tappet shaft. I prefer to one them, as shown, of asingle unitary structure cast in one with the engine cylinder, dividedinternally by suitable diaphragms or artitions into threecompartmentstarve en chambers or compartments to receive the two sets orintake and enhaust puppet valves which serve the opposite ends'of theengine cylinder, and an intermediate compartment to receive the cam ortappet portion of the valve 0 rating shaft which extends crosswise ofsaid intermediate compartment through suitable sep- -porting bearings(not shown) termed on opposite sides of the same. The two end valvecompartments or chambers are designated B, the intermediate compartmentor chamber, B and the cam or tappet valveoperatmg shaft, E. This shaftmay be of any suitable type, whether axially oscillatory orlongitudinally reciprocatory. For

the purpose of my present improvements, l'prefer a tappct shaft of theaxial oscillatory type, and it is so represented in the drawings. It isprovided, as shown, with a boss 6 provided with two sets ofvalveoperating devices, consisting each of two end lifts e and anintermediate recess 6, formed diametrically opposite to one another uponthe periphery of the boss. The opposite ends of the valve chamber areprovided with removable covers B, and the intermediate compartment 16 isprovided with a removable cover B The valve cages, valves, valvefittings and valve gear are the same for each compartmentB, so that adescription of one will answer for both.

The valve chamber is formed with a port a through which steam isadmitted to and erlid Bill

till

lit") hausted from that end of the engine cylin- .diaphragm D,

der with which the valve chamber is associated, and is machined outinternally to provide a seat for aisectional valve ca e C C which isremovably but closely tted therein and abuts .at its inner end againstan annular shoulder 12, the joint between the two being made steam tightby suitable means (not shown) to prevent the escape of steam into theintermediate tappet compartment B. The cage is also provided with asteam and exhaust port which registers with the port a in the valvechamber. The two sections, 0, C, of thevalve cage contain, the formerthe intake valve V and its valveseats 10, and the latter the exhaustvalve V and its valve'seats 'v'-the section C being seated against theannular shoulder b, and the section C butting up against section C, theabutting ends 0 the two sections being suitabl fastened together, ornot, as preferred. he cage is held in place a ainst the shoulder b by aclam ing ring 2 attached-to the inner face 0 f thecover B by le S Bf.

he two seats 0 of the intake valveV are in section C, the one upon anannular ledge c and the other upon a diaphragm or partition D; the twoseats '0' of the exhaust valve V are correspondingly located in section0' upon an annular ledge 0 and a respectively.' The chamber is providedwith a suitable steam intake passage S and an exhaust passage X.

The two sets of valves are arranged, tandem fashion, in axial alinement,one on the prolongation. of the other; and the pair of valves for eachset are correspondingly arranged relatively to each other, withtelescoping spindles, the spindle of one of the valves-in this instancethe'steam valve V- passing longitudinally and axially through thespindle of the other valve, and the two, which snu ly telescopetogether, being capable of independent longitudinal movement.

The exhaust valve V is located in the valve cage between the diaphragmsD and D. Its central tubular core fits upon, and is guided in itsmovements by, an axial tubular uide as fast on the diaphragm D, and preerably cast in. one therewith. The exhaust valve spindle 20 (which ismade tubular for purposes hereinafter indicated) passes axially throughthe diaphragm D and tubular guide at, until it brings up against theclosed end of the central tubular core of the exhaust valve-the tubularguide at servin to support and guide-rthe exhaust valve spindle w whichfits snugly? within "The valve is held normally. 1n closed position,against the lifting action of its spindle-,qby yielding pressure exertedby a springs" interposed between the diaphragm D. Similarly, the intakevalveand also, the exhaust-valveilifts e,

operates the intake valve V, the other to toperateathe lever M whichoperates the exhaust valve V, the rollers O at the elthe head of thevalve and} valve V is held in closed position with yielding pressure bya springs interposed betweenthe head of the valve and the valve chambercover core fits upon the exterior of a tubular guide B, and its tubularcentral w on diaphragm D in exactaxial alinement with the exhaust valvetubular guide as in the diaphragm D. The steam valve spindle w extendsinto and through the tubular exhaust valve spindle w. which it closelyfits,

thence out through a suitable aperture in two valves that may. occurduring their op-' eration.

The cam shaft E extends diametrically across between the two valvecompartments in a position to conveniently operate the valve spindlesthrough the intermediary of lift members supported in bearings, betweenthe telescoped ends of the valve spindles and the tappet shaft, inposition to engage the ends of their respectivevalve spindles, and tobeactuated by said shaft to move their respective spindles in a directionto open the valves appropriate to those spindles against the stress oftheir closing springs. The telescoped ends of the two spindles of eachof the two sets of valves extend through the diaphragms D of theirrespective cages into the space intervening between the said diaphragmsand the cam orf tappet shaft, and on diametrically opposite sides .ofsaid shaft. The lift members for each pair of valve spindles w, toconsist in thepresent instance, of two levers L, M, preferabl of theelbow type, pivoted in bearings attached to the valve cage, andpreferably to the diaphragm D of the section C of the cage, on that sideof the diaphragm facing the cam shaft E, as shown, and designed andarranged to engage and actuate the valve spindles. To this end, the twolevers face one another, and are'provided with rollers O at their elbowswhich are received in the cam recess e formed for their reception in theperiphery of the boss of the cam shaft E, said recess terminating at.the ends in he one to actuate the lever L which x btm7 s of' the leversserving to reduce the .-f1=i a1e between the elbows of the levers "andtheicam lifts over which they pass. The

in order to allow for slight aeeaeee preferred construction of theselevers is rep resented in Figs. 2 and 3. The tip Z of the free end ofthe lever L extends far enough toward the telescoped spindle ends tocome opposite to and rest against the base of the steam valve 5 indle w.The free end of the other lever is forked as shown more clearly in Fig.3, the prongs m of the fork straddling the tip Z of the lever L andextending far enough inward to reach and bear against a laterallyprojecting flange w on the annular base of the tubular exhaust valvespindle w. A clearance slot w in the end of the exhaust spindle permitsthe play of the elbow lever L necessary to give the proper lift to thesteam valve spindle w. The levers L, M, during the valve-liftingoperation, are held in close contact with their respective valvespindles and cam lifts by the yielding pressure exerted by the steam andexhaust valve-closing springs e, s.

The face-to-face arrangement of the two levers permits the cam lifts forthe two valves of each set to be placed at opposite ends of one and thesame recess as shown, provided the length of the latter be such that, atthe maximum stroke of the oscillatory tappet shaft, the cam lift at oneend of the recess will not reach the elbow of the lever which isdesigned to be operated by the cam lift at the other end of the recess.It will, of course, be understood that the two sets of lifting membersL, M, and their operating cam lifts or tappets are so disposedrelatively to one another that when the lift member L of one set isoperated to open the intake valve of the pair which serve one end of theengine cylinder, the lift member M of the other set simultaneously isoperated to open the exhaust valve of the pair which serve the oppositeend of the engine cylinder.

The marginal portion of the diaphragm lD surrounding the annular valveseat '0 thereon preferably has openings 03 in it (as shown) tofacilitate the delivery of steam to the steam admission cylinder port awhen the intake valve V is opened.

The mode of operation of my improved valve gear will be manifest fromthe description already given, and requires no further explanation.

Having described my improvement and the best way now known to me ofcarrying the same into practical effect, I state in conclusion that I donot limit myself to the structural details hereinbefore shown and setforth in illustration of my invention, since manifestly the same can bevaried without departure from the spirit of the invention; but what Iclaim herein as new and of my own invention, and desire to secure byLetters Patent is as follows 1. In a valve gear for steam engines thecombination of the following elements, namely-an engine cylinder; twovalve chambers mounted, at an interval from one another, on andlengthwise of said cylinder, one on the axial prolongation of the other;two sets of steam and exhaust valves, one for each valve chamber,mounted and ar ranged in their respective chambers-one set upon theaxial prolongation of the other; valve spindles, one for each valve, thespindles of the two valves of each set passing the one axially through,and telescoping with the other, the telescoped ends of the two sets ofspindles projecting in axial aline ment with one another through theinterior opposite closed ends of their respective chambers into theintervening space which separates said chambers; lift members, one foreach spindle, mounted and movable in bearings on the interior oppositeends of their respective valve chambers on opposite sides of thetelescoped ends of the sets of valve spindles with which they arerespectively associated with their free ends engaging the one the outerand the other the in ner one of said telescoped ends; and a cam ortappet valve-operating shaft extending through the interval whichseparates the two valve chambers crosswise of and between the opposedtelescoped ends of the two sets of valve spindles, and lift members withwhich they are associated and provided with two sets of recesses-and camlifts located on diametrically opposite faces of said shaft to engageand actuate the lift members of two sets-the combination being andacting substantially as set forth.

2. The combination of elements of claim 1, when the lift members arecomposed of elbow levers pivoted at their exterior opposite ends intheir supporting bearings facing one another with their interioropposite free ends in engagement with their respective telescopedspindle ends, and their elbows in engagement with the cam shaft.

3. The combination of elements of claim 1, when the two valvecompartmentsor chambers consist of a unitary cylindrical casingextending lengthwise of the engine cylinder and provided with removablecovers at its ends and two valve cages contained therein separated attheir interior opposite closed ends by an interval which provides anintermediate compartment for he housing of the valve gear and the tappetportion of the operating shaft.

In testimony whereof T aflix my si nature.

SEEGFRIED ROSENZ ETG.

